Question

3. Write the net ionic equation for each titration reaction and tell whether the pH at the equivalence point will be <7, = 7, or > 7. (a) HCO2H(aq) [formic acid; pk, 3.74]+ KOH(aq) (b) CH3CH2NH2(aq) [ethylamine; pK, for CH33CH2N H3 10.67] + HCI(aq)

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Answer 1

Answer HCD2H is an Weak acid HCO2H Cat) + Kel6e)+ OHar)-> HCo at)+ Kas) +Haoca) Total fonic Hco Car) + H20A) HcoH Cag) t OHCat) Net ionic PH at etuivalence point depends on hyarolysis of Hcor + H20 HCo2H HCD2 OH + Atsong baae Neak acid Basic PH>) CH3 CH2NH2 i& an weak base Total Tonic: c H3C H3 N H2 (41) + H1)tCa)- CHaCH2NH Ca.) + eleCar.) fonic: H3CHaN Ha .) + Net HCa) CH3CH2 N HCa) PH at equivalence Point dapends on hydrolyais of CHCH2NH CH3CHNH H20 CHCHNH2 H30 (stoong acid) Cwweak base) acidic (PH<7)